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Selection Of Sludge Conditioning Chemicals And Filter Media For Vacuum Filter Dewatering Of Sludge At The Atlantic Wastewater Treatment Plant, Douglas W. Fredericks

Civil & Environmental Engineering Theses & Dissertations

A literature review was conducted to determine the types of vacuum filter systems available for sludge dewatering, the characteristics of wastewater sludge which are important to dewatering, and the methods of sludge conditioning for vacuum filtration which are available. Capillary suction time and Buchner funnel tests were performed to determine the dewatering characteristics of sludge conditioned with ferric chloride and lime, polymer, polymer and lime, and polymer and incinerator ash. Filter leaf tests were performed to determine filter cake release characteristics of various conditioned sludge and the performance characteristics of several filter media. It was determined that ferric chloride and …

Biographical Themes In T. S. Eliot's Early Poetry, Jeo-Yong Noh

English Theses & Dissertations

Throughout his career, T. S. Eliot developed his central poetic doctrine, the theory of poetic impersonality. Because of the importance of this theory to Eliot, a question is raised about its importance to his own poetry. Some recent critics, examining Eliot's poetry in the light of his memoirs and biographies, have found that Eliot was not governed by his theory. My thesis is designed to continue this investigation which so far has been done incompletely and randomly.

This investigation finds that Eliot suffered from a congenital double hernia, from his disastrous first marriage, and from general poor health. Furthermore, in …

Characterization Of Trihalomethane Formation From Proteins In Chlorinated Water, Robert Aaron Kravitz

Chemistry & Biochemistry Theses & Dissertations

Traditionally humates have been considered the most significant precursor in the formation of trihalomethanes in finished drinking water. This study investigates another potential precursor, namely proteins. The chlorination of aqueous protein solutions yields significant levels of trihalomethanes in terms of the maximum contaminant level (MCL) of 0.100 mg/L imposed by the USEPA. Molar yields for several proteins were determined. The average yield per unit of organic carbon was 0.5% as compared to 0.8% for a humic acid studied. A model protein, bovine serum albumin, was studied extensively to ascertain the effects of total organic carbon, chlorine dose, and time on …

Block Encoding Of Speech Spectral Principal Components, James R. Holland Jr.

Electrical & Computer Engineering Theses & Dissertations

A Karhunen-Loeve series expansion was used to block encode speech spectral principal components as a function of time. Each of ten principal components was first obtained as a linear combination of 2© speech spectral band energies. Using a fixed block length of 10 frames (0.128 s), the K-L basis vectors were computed separately for various speakers for each principal component. In all cases the resulting basis vectors were essentially a set of discrete cosine basis vectors. Synthesis of speech from the block encoded parameters showed that very little information is lost with up to 70% data reduction. The block encoding …

An Experimental And Analytical Investigation Of Friction Factors For Fully Developed Flow In Internally Finned Triangular Ducts, Hoshang Chegini

Mechanical & Aerospace Engineering Theses & Dissertations

Friction factors for fully-developed flow in triangular ducts with fins of various sizes are investigated for Reynolds numbers ranging from 150 to 90,000. Two triangular ducts having apex angles of 60 and 38.8 degrees are studied. Results are presented in the form of standard plots of friction factor as a function of Reynolds number. Friction factor values for the smooth triangular-duct cases are in good agreement with the existing results. For the finned-duct cases, the fully developed axial-velocity profiles in laminar flow are determined by solving the x-momentum equation iteratively by the Gauss-Seidel finite difference technique. The theoretically determined friction …

Triple Trigonometric Series And Their Application To Mixed Boundary Value Problems, Gordon Melrose

Mathematics & Statistics Theses & Dissertations

In this dissertation the author investigates some triple trigonometric series which occur in the solution of mixed boundary value problems in elasticity and potential theory. By choosing a suitable integral representation for the sequence of unknown constants, the problem is reduced to solving a singular integral equation of the first kind. Twenty four cases in which the integral equation can be solved in closed form are discussed in detail.

In later chapters, the application of triple trigonometric series to problems in physics and engineering is demonstrated and closed form solutions for the physical parameters of interest are obtained.

Factors Influencing College Choice Of Minority Students And Their Implications For Recruitment, Linda Blount Mccluney

Theses and Dissertations in Urban Services - Urban Education

This study was designed to determine factors of college choice and to evaluate their implications for the development of recruiting guidelines for minority students. The intent was to survey two hundred freshmen of two urban universities to determine which factors were influential in their college choice process and to design recruiting guidelines. The use of these guidelines may provide the impetus to direct more blacks to predominantly white urban universities and more whites to predominantly black universities.

The criterion group approach allowed for the two groups (black students attending a predominantly white university versus black students attending a predominantly black …

The Role Of Colonization Predation And Season In Determining Macroinvertebrate Community Structure In A Temperate Lake, Cheryl Lynn Frew

Biological Sciences Theses & Dissertations

Field experiments were conducted to examine the effects of distance from shore, vertebrate predation, and season on macroinvertebrate colonization dynamics in a temperate lake in Suffolk, VA. In a year-long colonization study, artificial plants, half of which were caged to exclude vertebrate predators, were deployed in patches at three distances from shore (2m, 15m, 50m). Artificial plant subsamples were removed at weekly intervals over 28 days during four seasons to monitor colonization by macroinvertebrates. Colonization of artificial plants occurred more quickly in the summer and spring than in fall and winter. The interactive effect of distance from shore and cage …

A 250-Kv Two-Pulse Modulator For The Gas Flow Switch Test Facility, David Michael Barrett

Electrical & Computer Engineering Theses & Dissertations

High-pressure spark gap switches are often used in pulsed power systems because of their high power capabilities. Unfortunately, these switches cannot be operated at high repetition rates because of the time required for the switch to recover. However, the recovery rate of a spark gap may be improved by flowing a gas through the interelectrode region so as to remove the hot gases and debris.

A test facility has been designed and constructed at Old Dominion University to evaluate the performance of gas-flow spark gap switches operating over a wide range of voltages and flow parameters. The facility consists of …

A High-Resolution Bathymetry Map For The Marguerite Bay And Adjacent West Antarctic Peninsula Shelf For The Southern Ocean Globec Program, S. T. Bolmer, R. C. Beardsley, C. Pudsey, P. Morris, P. Wiebe, Eileen E. Hofmann, J. Anderson, A. Maldonado

OES Faculty Publications

One objective of the U.S. Southern Ocean Global Ocean Ecosystems Dynamics (SO GLOBEC) program is to gain a better understanding of the sea floor bathymetry in the program study area. Much of Marguerite Bay and the adjacent shelf west of the Antarctic Peninsula were poorly charted when the SO GLOBEC program started in 2000. Before the first SO GLOBEC cruise, an improved local area version (ETOPO8.2A) was created from the Smith and Sandwell (1997) topo_8.2.img 2-minute digital gridded bathymetry for the study area. The first SO GLOBEC mooring cruise on the R/V Lawrence M. Gould (March 2001) showed that the …

How Registered Nurses In Skilled Nursing Facilities Rate The Importance Of And The Frequency Engaged In Specific Nursing Behaviors Related To Their Role, Christine Anne Heine

Ellmer School of Nursing Theses & Dissertations

Registered nurses in skilled nursing facilities were surveyed using the Six-Dimension Scale of Nursing Performance to determine: (1) how they rated the importance of specific nursing behaviors related to their role, (2) how they rated the frequency engaged in the same specific nursing behaviors related to their role, and (3) if there was a relationship between how they rated the specific nursing behaviors for importance and frequency. There were five subgroups of nursing behaviors: (a) leadership, (b) nursing process, (c) teaching and collaboration, (d) interpersonal relations and communication, and (e) professional development. Registered nurses rated all of the behaviors as …

A Study Of Loneliness And Health Related Complaints In Residents Of High Rise Apartment Buildings For The Elderly, Susan H. Jones

Ellmer School of Nursing Theses & Dissertations

The purpose of this study was to explore feelings of loneliness among relocated elderly residents of age-segregated, high-rise apartment buildings and any relationship between these subjective feelings of loneliness and certain variables which were hypothesized as predictors of feelings of loneliness. The variables studied in relation to loneliness were cathectic investment, activity, and perceptions of health. A non-experimental survey design where data were collected by interviewing subjects was used. The sample consisted of 18 female residents of a high-rise apartment building for the elderly. Each was interviewed using the Loneliness Rating Scale developed by Dr. Gloria M. Francis and a …

Feasibility Studies Of Conversion Electron Mössbauer Spectroscopy (Cems) Of Iron-Doped Inp, Gilbert R. Hoy, Desmond C. Cook, Edward Agyekum

Physics Faculty Publications

An electron detector for conversion electron Moessbauer spectroscopy CEMS has been designed and built. Tests have been performed to study the effects on the detector resolution with respect to high voltage, gas flow rate, and counting rate. These parameters have been optimized to detect the 7.3keV conversion electrons emitted following resonant absorption of the 14.4keV source gamma rays associated with the Moessbauer effect using Fe57. CEMS spectra have been obtained using standard Fe57 enriched and natural iron samples. CEMS spectra have also been obtained for InPFe samples supplied by the Naval Research Laboratory. So far we have only been successful …

Human Need Fulfillment Alteration In The Client With Uterine Cancer: The Registered Nurses' Perception Versus The Clients' Perception, Linda Lane Lilley

Ellmer School of Nursing Theses & Dissertations

This study was a comparison of the similarities and differences between the registered nurses' perception and clients' perception of human need fulfillment alterations in the client with uterine cancer. The effect of level of educational preparation and number of years work experience on the nurses' perception was also analyzed. The participants were 15 registered nurses and 15 clients who had uterine cancer and were admitted to two acute care hospitals in Tidewater. Registered nurses were asked to complete the tool entitled Human Needs Assessment Scale and rate the 35 human needs in relation to the perceived importance for the client. …

Admissions Criteria As Predictors Of Students' Successful Completion Of A Dental Hygiene Program, M. Linda Brown

Dental Hygiene Theses & Dissertations

The purpose of this study was to investigate the criteria used to select dental hygiene students and to determine the ability of these criteria to predict students' successful completion of a dental hygiene program. One hundred sixteen graduates of the certificate level dental hygiene program at Old Dominion University between 1971- 1981, inclusive, comprised the sample. The majority of the subjects were Caucasian females, ages 20 to 24. The admissions criteria examined were (1) Dental Hygiene Aptitude Test scores, (2) Scholastic Aptitude Test scores, (3) preadmission quality point average, (4) college chemistry quality point average, and (S) percentile rank in …

Investigation Of The Coenzyme Binding Site Of Lactate Dehydrogenase From Chicken Muscle, Jia-Hwei Lin

Chemistry & Biochemistry Theses & Dissertations

Investigation of the coenzyme binding site of lactate dehydrogenase was approached by using coenzyme analogs. Inhibition studies of this enzyme using n-alkylphosphates as coenzyme analogs were performed with a fluorometric method. The results showed that all of the n-alkylphosphates were competitive inhibitors with respect to NAD⁺.

The n-alkyl-ADPs were synthesized from AMP and dicycloheaylammonium salts of n-alkylphosphates. The synthetic compounds were subjected to NMR spectroscopic studies, thin layer chromatography and determination of the ratio of adenosine moiety to phosphate groups. The results indicated that the synthetic compounds were n-alkyl-ADPs.

These synthetic compounds were used as coenzyme analogs in …

Effects Of Encoding Variety And Concurrent-Task Practice On The Transfer And Retention Of Complex Skill, Peter S. Winne

Psychology Theses & Dissertations

The present study investigated the effects of dual-task practice and the variety of problems solved during practice on (a) the acquisition of procedural and declarative skills and the development of concurrent-task skills, and (b) the utilization and maintenance of two types of strategies. Strategies were defined as the use of different mixes of skills pertaining to procedures and specific declarative solutions. Two tasks--mental arithmetic and trigrams--were used to examine problem-solving skills and strategies both immediately following practice and again under delayed conditions. Eighty subjects were randomly assigned to one of four practice conditions by factorially combining practice mode (single- or …

Timing Of The Blue Crab Fisheries Of Virginia And Its Application To Harvest Management, J. Dale Shively

OES Theses and Dissertations

The timing of a fishery is a quantitative expression of the composite behaviors of harvesters, markets, animals and climatic events. A quantitative description of the timing of the blue crab (Callinectes sapidus) fisheries of Virginia was established using the time density model of Mundy (1979). Blue crab catch statistics supplied by the National Marine Fisheries Service and the Virginia Marine Resource Commission were divided into two fisheries based on gear type; the summer and winter fisheries. Average performance curves were then constructed using average cumulative proportions of catch. Annual yield estimates were also made and timing in five …

Determinants For The Timing Of Escapement From The Sockeye Salmon Fishery Of The Copper River, Alaska: A Simulation Model, Howard A. Schaller

OES Theses and Dissertations

A model to estimate determinants for migratory timing of catch and escapement in a terminal salmon fishery is presented. A method was developed to estimate average seasonal migration rates of salmon through a harvest area from catch and escapement data. The time series for the total population of Copper River sockeye salmon (Oncorhynchus nerka) was reconstructed in the reference frame of the commercial harvest area from catch and escapement data.

The catchability coefficients (q), derived from the reconstructed populations were found to vary within season and between seasons. The relation between q and effort was attributed to a …

The Aquatic Geochemistry Of The Particle-Reactive Radionuclides Po-210, Pb-210, And Be-7, James Forrest Todd

OES Theses and Dissertations

Integrated monthly wet-only and bulk precipitation samples for Be-7 and Pb-210 analysis were collected from November 1982 through October 1983 at two sites in lower Chesapeake Bay. Atmospheric deposition fluxes for Be-7 in wet-only and bulk precipitation averaged 0.013 and 0.014 pCi/cm²/d, respectively, and for Pb-210 averaged 0.36 and 0.40 pCi/cm²/yr, respectively, suggesting that dry deposition makes only a minor contribution to the total fluxes.

A seasonal trend was observed in the depositional flux of Be-7, with a pronounced maximum in the Spring. Approximately 40 percent of the annual Be-7 deposition occurred between February and April, …

A Theoretical Model For Calculation Of Molecular Stopping Power, Yuan-Jian Xu

Physics Theses & Dissertations

A modified local plasma model based on the work of Linhard-Winther, Bethe, Brown, and Walske is established. The Gordon-Kim's molecular charged density model is employed to obtain a formula to evaluate the stopping power of many useful molecular systems. The stopping power of H₂ and He gas was calculated for incident proton energy ranging from 100 KeV to 2.5 MeV. The stopping power of O₂, N₂ and water vapor was also calculated for incident proton energy ranging from 40 keV to 2.5 MeV. Good agreement with experimental data was obtained.

A discussion of molecular effects leading …

Phytoplankton Ecology And Dynamics In The James River Estuary Virginia, U. S. A., Margaret J. Filardo

OES Theses and Dissertations

Autotrophic biomass and productivity as well as nutrient distributions and phytoplankton cell populations in the James River estuary, Virginia, from Newport News Shipyard to the 0 o/oo isohaline, were sampled on a monthly basis from August of 1981 to December of 1982. Particular emphasis was placed on the very low salinity region (defined as the location where surface salinity measured between 0.0 and 0.75 o/oo based on conductivity) in order to determine the fate of fresh water phytoplankters upon being advected into the estuary because of their suspected role in the biogeochemical cycling that occurs there.

Both chlorophyll a and …

Finite Element Thermal-Structural Analysis Of Cable-Stiffened Space Structures, Ajay Kumar Pandey

Mechanical & Aerospace Engineering Theses & Dissertations

Finite element thermal-structural analyses of cable-stiffened space structures are presented. A computational scheme for calculation of prestresses in the cable-stiffened structures is also described. The determination of thermal loads on orbiting space structures due to environmental heating is described briefly. Three finite element structural analysis techniques are presented for the analysis of prestressed structures. Linear, stress stiffening and large displacement analysis techniques are investigated.

The three techniques are employed for structural analysis of prestressed cable structures at different prestress levels. The three analyses produce similar results at small prestress. but at higher prestress differences between the results become significant. For …

The Development Of A Microprocessor Controlled Linearly Actuated Valve Assembly, Raymond H. Wall

Mechanical & Aerospace Engineering Theses & Dissertations

The development of a proportional fluid control valve/assembly is presented. This electro-mechanical system is needed for space applications to replace the current proportional flow controllers that use bulky hydraulic or pneumatic actuation systems. The flow is controlled by a microprocessor system that monitors the control parameters of upstream pressure and requested volumetric flow rate. The microprocessor achieves the ·proper valve stem displacement by means of a digital linear actuator. A linear displacement sensor is used to measure the valve stem position. 'Ibis displacement is monitored by the microprocessor system as a feedback signal to close the control loop. With an …

Trait Anxiety In Female Heads Of Household, Bonnie Martinette Wheeler

Ellmer School of Nursing Theses & Dissertations

The purpose of this investigation was to determine if being the female head of a single-parent household was associated with increased trait anxiety. Ninety-four female nurses completed the Trait portion of the State-Trait Anxiety Inventory developed by Spielberger, Gorsuch, and Lushene (1964) and a demographic inventory. The demographic inventory provided the information regarding marital status and presence or absence of children needed to delineate the sample into four groups: Group I (n=31) married females with dependent children in the home; Group II (n=10) married females with no dependent children in the home; Group III (n=26) single, separated or divorced females …

Predictors Of Appointment-Keeping Behaviors Among Users Of Adult Medical Clinics, Ruth L. Campau

Ellmer School of Nursing Theses & Dissertations

In a descriptive correlational study, three predictors of appointment keeping behaviors of adults who attend general medical clinics in a primary health care setting were explored. The three selected predictors from the Health Belief Model, a preventive health behavior model, were: (a) perceived barriers to health care, (b) health locus of control (HLC), and (c) satisfaction with health care. The purpose of this study was to identify the predictive value of multiple variables for a specific health-related behavior. Data on the study were collected on a non-probability, purposive sample of 52 users of the adult general medical clinics. The tool …

Partial Radiative Recombination Cross Sections For Excited States Of Hydrogen, Patricia M. Fazio

Physics Theses & Dissertations

In calculating the radiative recombination cross sections for interstellar H II regions usually only the electric dipole term in the expansion of the interaction Hamiltonian is kept. However, conditions present in these regions permit recombination into highly excited states and the "effective size" of the atom is not much less than the wavelength of the emitted photon. These physical conditions do not meet the requirements for making the dipole approximation. A higher order approximation is to keep an additional term in the expansion of the Hamiltonian, and, therefore, to include contributions of quadrupole transitions in the calculation of the partial …

An Examination Of The Variability Of Migratory Timing Statistics Estimated From Catch And Effort Observations, Arthur J. Butt

OES Theses and Dissertations

The estimate of the mean arrival time based on catch or CPUE of fishes migrating into a fixed harvest area is a function of the number of days fished. Simulation studies using chinook salmon catch and effort data from the Yukon River delta, Alaska indicate that fishing effort concentrated at the tails of the migratory distribution which would tend to erroneously weigh the estimated mean arrival time in the direction of the sample, away from the true mean, is only a significant problem when the number of days open to fishing is small, covering less than 12% of the total …

Design Of Multivariable Feedback Control Systems Via Spectral Assignment Using Reduced-Order Models And Reduced-Order Observers, Preston Ivanhoe Carraway Iii

Electrical & Computer Engineering Theses & Dissertations

The feasibility of using reduced-order models and reduced-order observers with eigenvalue/eigenvector assignment procedures is investigated. A review of spectral assignment synthesis procedures is presented. Then, a reduced-order model which retains essential system characteristics is formulated. A constant state feedback matrix which assigns desired closed loop eigenvalues and approximates specified closed loop eigenvectors is calculated for the reduced-order model. It is shown that the eigenvalue and eigenvector assignments made in the reduced order system are retained when the feedback matrix is implemented about the full order system. In addition, those modes and associated eigenvectors which are not included in the reduced-order …

The Shenandoah National Park: Its Impact On A Mountain People, Scott Shelton

History Theses & Dissertations

The creation of the Shenandoah National Park in Virginia during the 193Os profoundly affected the lives of hundreds of mountain people who had eked out an existence to the region for generations. While removing these people naturally caused inconveniences and disrupted a way of life, the positive results outweighed the negative. Higher standards of living generally accompanied the change, and few former residents expressed discontent over their new way of life.

This removal of the mountaineers was simply one of many episodes in American history where the federal government has played a role in moving people, thereby changing their lifestyle. …